Adachi was originally a police officer in Kanagawa Prefecture. During the 1990s, he had taken down the Yokohama Pink Panthers, which was a group of burglars committing crimes across Isezaki Ijincho. In a case where he was investigating a robbery and double homicide of an old couple, he would come to arrest a man named Kusumi. Kusumi, who was innocent, was sentenced to 17 years in prison because Juro Horinouchi used witness intimidation to remove any alibi.